"If you were going to give rock 'n' roll another name, you might call it 'Chuck Berry'," John Lennon once commented. On May 21, 1955, Berry took an old Western swing song, gave it a boost with his signature electric guitar licks, and renamed it "Maybellene," thus kick-starting a massive shift in musical history. As this program demonstrates, the hit song is rightfully one of NPR's "100 Most Important American Musical Works of the 20th Century."